System and method for opening a concentrate container and connecting the concentrate container to a blood treatment device

ABSTRACT

The present invention refers to a system and method for opening a concentrate container without the need for a human to directly handle the concentrate container and connecting the concentrate container to a blood treatment device. Aspects of the invention are directed to a container for concentrate and a blood treatment device.

The present invention refers to a system and a method for opening a concentrate container and connecting the concentrate container to a blood treatment device. Further aspects of the present invention refer to a container and a blood treatment device configured to be used in a method according to the present invention.

For chronic blood treatment, especially for chronic dialysis, nowadays almost exclusively bicarbonate-based dialysis solutions are used, that are generated by the blood treatment device itself/online during treatment by diluting an acidic and a basic concentrate, preferably a powder concentrate, with water. Thus, it is established practice that the basic concentrate is generated online during the treatment, i.e. that liquid basic concentrate is continuously generated during the treatment by diluting a dry concentrate/powder concentrate with water.

For this purpose, dry powder concentrate is generally provided in a container that is fluidically coupled to the blood treatment device so that water can be dispensed into the container by the blood treatment device for dissolving the dry concentrate. Simultaneously the basic liquid concentrate/the bicarbonate solution generated in this way is withdrawn by the blood treatment device from the concentrate container. Such a conventional concentrate container is known from e.g. EP1344550.

In conventional blood treatment devices known from the prior art, the concentrate container cannot be connected to the hydraulic system/fluidics system of the blood treatment device during disinfection/rinsing of the blood treatment device.

For this reason, medical personnel has to connect the concentrate container to the blood treatment device after disinfection/rinsing of the blood treatment device and prior to preparing/priming the extracorporeal circuit of the blood treatment device for treatment. This necessitates medical personnel manually removing a lid/seal from the container prior to fluidically connecting the container to the blood treatment device. Such manual handling of the container poses a risk of contamination of the concentrate contained in the container and thus leads to deficiencies in hygiene.

It is thus an object of the present invention to provide a container for concentrate that can be connected to the blood treatment machine in a more hygienic way to reduce the possibility of contaminations. The present invention achieves this object, because according to the present invention a fluid connection between the machine and the container is established after disinfection or cleaning of the blood treatment machine, without handling/manual opening of the container by medical personnel being required. According to the present invention, the lid/seal of the container is removed by an interaction of the blood treatment machine with the container without the need of a human directly touching or handling the container just prior to fluidically connecting the container to the blood treatment machine.

Because the container is opened without direct human contact just prior to fluidically coupling the container to the blood treatment device, especially to a fluid dosing unit of the blood treatment device, contamination of the contents of the container can be avoided.

Furthermore, according to the prior art, a certain amount of force is necessary to connect the container to the blood treatment device. In order to make the blood treatment device and the concentrate container as user-friendly as possible, conventionally the blood treatment machine and the corresponding concentrate container are configured in such a way that a connection element of the container is inserted into a connection element of the machine in a downward movement, so that gravity assists the movement of the connection element of the container into/over the connection element of the machine.

However, this configuration has the disadvantage that because of the opening of the connection element of the container being opened in a downward direction (so that it can be coupled with a corresponding connection element of the blood treatment device by moving the connection element of the container from above in a downwards movement of the connection element of the blood treatment device) after a treatment has ended and the concentrate container is removed from the blood treatment device, liquid concentrate can drip from the connection element of the container. This liquid concentrate can then collect in the connection element of the blood treatment device causing undesired crystallization and thus potential clogging of the connection element of the blood treatment device.

In addition to that, in blood treatment devices according to the prior art, liquid concentrate can spill, leak or drop from a withdrawal line of the blood treatment device configured to withdraw concentrate from the container upon disconnection of the container from the blood treatment device. Since the liquid concentrate contains solutes, crystallization may occur as an additional disadvantage to these spillages generally not being hygienic.

This liquid concentrate can then collect in the connection element of the blood treatment device causing undesired crystallization and thus potential clogging of the connection element of the blood treatment device.

Thus, it is a further object of the present invention to provide a container and/or a system comprising a container and a blood treatment device, which avoids such undesired dripping of liquid concentrate during the removal of the container from the blood treatment device.

This object is solved by the present invention. The present invention uses the container to collect any drops dripping from the connection elements of the blood treatment device. For this purpose, the opening element(s) of a container according to the present invention are preferably opened in a upward direction so that the connection element(s) of the blood treatment device can be inserted into the opening element(s) of the container from above in a downward motion or the connection elements of the container can be moved in an upward motion so that the hat the connection element(s) of the blood treatment device can be inserted into/onto the openings/connection element(s) of the container.

Furthermore, the present invention provides a container that is easier and cheaper to manufacture as fluid flows along connection elements in the form of linear channels through a connection portion of the container from the blood treatment device into the container. In other words, the structure of the connection portion of the container can be simplified in comparison to the prior art in which the fact that the connection portion generally is connected to the blood treatment device via a downward movement dictates a design in which the openings are opened at a lower surface of the connection portion. Thus, according to the prior art fluid flow through the connection portion of the container is not strictly linear/unidirectional but the fluid is diverted in multiple directions which requires a more complex design and more material.

In addition to that, the structure of a container according to the present invention and especially the structure of the connection portion thereof allows filters to be mounted more easily into the openings of a fluid inlet and/or outlet of the container.

A container for concentrate according to an aspect of the invention comprises a main body for containing concentrate, at least one attachment element configured to reversibly attach the container to at least one corresponding attachment element present on a blood treatment device, and at least one connection element, configured to interact with at least one corresponding connection element present on a blood treatment device to fluidically couple the container with the blood treatment device, wherein the at least one attachment element projects in a first direction and the at least one connection element projects in a second direction that is oriented essentially at right angles to the first direction.

According to a preferred embodiment, the first direction in that the at least one attachment element projects is oriented essentially at right angles to the longitudinal axis of the main body of the container. The attachment element of the blood device is inserted into the attachment element of the container preferably along the first direction. If the attachment element of the container is hook-shaped, an attachment element of the blood treatment device that is inserted into the hook-shaped attachment element of the container preferably projects along the first direction.

Furthermore, it has proved advantageous if the second direction in that the at least one connection element projects is oriented essentially in parallel to the longitudinal axis of the main body of the container and the at least one connection element has the form of a hollow cylinder opened at an end surface of the container opposite to the main body of the container and configured to receive a corresponding connection element, e.g. a spout, of the blood treatment device. The at least one connection element of the container preferably has an opening at the (top) end surface of the container facing away from the main body of the container.

According to one preferred embodiment of the invention, the container comprises two attachment elements each formed as a hook configured to be hooked over a corresponding attachment element present on a blood treatment device that is preferably formed as stud, preferably comprising a circumferential groove, for receiving the hook of the container, thereby to reversibly attach the container to the blood treatment device.

According to an alternative embodiment of the invention the container comprises two attachment elements each formed as a hollow cylinder configured to receive a corresponding attachment element present on a blood treatment device formed as a stud to be inserted into the hollow cylinder of the container, thereby to reversibly attach the container to the blood treatment device.

According to another aspect of the invention the container comprises two connection elements in the form of hollow cylinders opened at an end surface of the container opposite to/facing away from the main body of the container and configured to receive a corresponding connection element, e.g. spout, of the blood treatment device, wherein the spout of the blood treatment device is inserted into each hollow cylinder in a direction projecting from the end surface of the container opposite to the main body of the container towards the main body of the container.

In order to ensure storage stability of concentrate contained within the container, the at least connection element is advantageously sealed by a lid, preferably in the form of a flexible film, that is removably attached to an end surface of the container opposite to/facing away from the main body of the container.

For example, the lid can be glued or welded to the end surface of the container opposite to the main body of the container. When the container is attached and connected to a blood treatment device, the end surface comprising the opening of the at least one connection element of the container preferably is facing the at least one connection element of the blood treatment device and forms a top end surface of the container.

To make the container more user friendly, the flexible film forming the lid preferably comprises a surface configured to be easily peeled from the end surface of the container. In other words, the surface of the flexible film is surface-treated to allow a user to easily peel the flexible film from the end surface of the container thereby to expose the at least one connection element of the container and for example a central opening of the container through that the container can be filled with dry concentrate.

In order to ensure correct mounting of the container to a blood treatment device, the container can be configured to attach to the blood treatment device according to a lock-and-key-configuration. For this purpose, the container can comprise two attachment elements that are formed in different sizes and/or geometrical configurations to allow attachment of the container to a blood treatment device in only one defined mounting position. The blood treatment device in this embodiment preferably comprises two corresponding attachment elements in different sizes and/or geometrical configurations.

Alternatively or additionally, the container or the blood treatment device can comprise two connection elements that are formed in different sizes and/or geometrical configurations to allow fluidic coupling of the container to a blood treatment device in only one defined mounting position. The blood treatment device or the container in this embodiment preferably comprises two corresponding connection elements.

The number of attachment elements and/or connection elements present on the container and/or the blood treatment device is arbitrary and can be varied according to specific applications.

According to a preferred embodiment of the invention, the container for concentrate can further be configured to be openable by a blood treatment device. In other words, the container is configured so that that connection elements of the container remain sealed by a lid, preferably in the form of a flexible film, as long as possible and the lid is removed immediately prior to fluidically coupling the container to the blood treatment device.

In other words, the blood treatment device and the container can be configured in such a way that a defined relative movement of the container and the blood treatment device or a component thereof removes the lid/seal from the container. The relative movement of the blood treatment device and the container can be performed automatically, e.g. via motorized components, or manually, e.g. by a user actuating a lever or similar structure.

For this purpose, a container according to the present invention can comprise at least one opening element configured to interact with a blood treatment device so that a lid sealing the connection elements of the container is removable/removed by a blood treatment device prior to establishing a fluid connection between the container and the blood treatment device.

According to a preferred embodiment of the invention, the container comprises two opening elements, preferably in the form of stiff levers that are attached to the lid of the container at two opposing sides of a connection portion of the container. Preferably, the two opening elements are arranged between the lid and a preferably flat end surface of the connection portion of the container, so that a movement of the opening elements in a direction away from the end surface of the connection portion would result in the lid being removed/peeled off the end surface of the connection portion.

Preferably, the opening elements in the form of stiff/inflexible levers each comprise a curved portion, preferably curved away from the end surface of the connection portion of the container. This has the advantage that, if the container is pulled towards the side surface of a blood treatment device, the curved levers will slide against an outer surface of the blood treatment device and be moved in an upward direction due to the curve of the levers. The upward movement of the levers will then peel the lid off the end surface of the connection portion.

In this description, it is assumed that the main body of the blood treatment device comprises a top surface, a bottom surface and four side surfaces. Depending on the direction of view from a user, a side surface of the blood treatment device can also be referred to as a front surface.

The opening elements/levers are preferably movable relative to the end surface of the connection portion of the container. For example, the levers can be connected to the connection portion via hinges. Alternatively, the levers can be attached to the lid and held to the connection portion only by the lid that is attached to the connection portion. In this configuration, the levers are not directly attached to the connection portion but merely lie loosely atop the connection portion and are held in place by the lid.

Alternatively or additionally, automatic opening of the container by the blood treatment device can be achieved by the lid of the container having an attachment portion configured to reversibly attach the lid to the blood treatment device. For example, the attachment portion of the lid can comprise an opening/hole into which a lid removal element of the blood treatment device can be inserted.

If a container having such a lid is moved relative to the blood treatment device, the attachment portion of the lid fixedly attaches the lid to a corresponding lid removal element of the blood treatment device so that the lid is locked in a stationary position relative to the blood treatment device. Thus, the relative movement of the container relative to the blood treatment device results in the lid being removed from the container/peeled off an end surface of the connection portion of the container.

According to the one embodiment, the attachment portion of the lid has to be manually attached to the lid removal element of the blood treatment device prior to a relative movement of the container to the blood treatment device. Alternatively, the attachment portion of the lid and the lid removal element of the blood treatment device can be configured in such a way that the attachment portion of the lid attaches to the lid removal element of the blood treatment device when the relative movement of the container to the blood treatment device commences/in the early stages of the relative movement of the container to the blood treatment device. Another aspect of the invention refers to a blood treatment device configured to be used with a container according to the present invention.

Such a blood treatment device comprises a main body, at least one attachment element to that a corresponding attachment element of a container for concentrate can be attached, wherein the at least one attachment element is movable relative to the main body in a direction projecting essentially at right angles from a side surface of the main body, and at least one connection element configured to fluidically couple the blood treatment device to a container for concentrate.

In a preferred embodiment of the invention, the at least one attachment element of the blood treatment device has the form of a pin or stud projecting outward from a side surface of the main body and the at least one connection element has the form of a spout projecting in a direction essentially parallel to the side surface of the main body.

It has proved advantageous if the blood treatment device further comprises a movable and/or motorized guiding element in that preferably a cavity is formed and the at least one attachment element is mounted onto the movable and preferably motorized guiding element. The guiding element can be moved/is movable into a first position, in that the at least one connection element of the blood treatment device, preferably a spout for fluidically connecting the blood treatment device to a container, is received in the cavity present on the guiding element thereby allowing the blood treatment device to be rinsed.

In the first position, the cavity in the guiding element short-circuits and/or closes the internal fluidic circuits of the blood treatment device to form a closed circuit so that rinsing liquid can be circulated in the blood treatment device.

The guiding element can also be moved/is movable into a second position in that the spout is fluidically connected to a container attached to the at least one attachment element of the blood treatment device. The guiding element is preferably movable in the horizontal and/or vertical direction.

In the second position, the guiding element preferably positions the container attached to the at least one attachment element mounted on the guiding element, especially the at least one connection element of the container, relative to the at least one connection element of the blood treatment device so that the container is fluidically coupled to the blood treatment device.

The guiding element can be moved by a motor of the blood treatment device. In this case, movement of the guiding element is preferably automatic. Alternatively, the guiding element may be manually moved. In this case the blood treatment device preferably has a lever or similar structure that allows a user to manually move the guiding element.

Preferentially, the at least one connection element of the blood treatment device, for example, the spout, is movable in a vertical direction essentially parallel to a side surface of the main body of the blood treatment device.

In a preferred embodiment, the at least one connection element of the blood treatment device is movable in a downward direction towards a bottom surface of the main body of the blood treatment device. Additionally or alternatively, the at least one connection element of the blood treatment device is movable in an upward direction towards a top surface of the main body of the blood treatment device.

For example, the at least one connection element of the blood treatment device can be first moved upwards to allow a container attached to the attachment elements to be moved by the guiding element into a position in that the at least one connection element of the blood treatment device and the at least one connection element of the container align in a vertical direction.

Subsequently, the at least one connection element of the blood treatment device can be moved by the guiding element downwards to fluidically couple the container to the blood treatment device, for example, by inserting the at least one connection element of the blood treatment device into the at least one connection element of the container.

At a later stage, for example, after the concentrate contained in the container has been used up, the at least one connection element of the blood treatment device can be retracted upwards again to withdraw the at least one connection element of the blood treatment device from the at least one connection element of the container to thereby fluidically separate/decouple the container and the blood treatment device from each other.

The blood treatment device preferably further comprises a projection portion present on a side surface of the main body. The guiding element is preferably movable relative to the projection portion in the fashion of a drawer. In other words, the guiding element can be slidably moved relative to the projection portion in a direction essentially at right angles to the side surface of the blood treatment device, i.e. in a horizontal direction.

Preferably, the at least one connection element of the blood treatment device is mounted to the projection portion and can be moved in a direction essentially parallel to the side surface of the blood treatment device to project (preferably in a vertical direction downwards towards the bottom surface of the blood treatment device) out from the projection portion. Further preferably, the at least one connection element of the blood treatment device can be retracted/moved into the projection portion in a vertical direction essentially parallel to the side surface of the blood treatment device.

The movement of the guiding element and/or the at least one connection element of the blood treatment device can be performed automatically or non-automatically, motorized and/or manually.

According to a preferred aspect of the invention, the blood treatment device comprises two attachment elements each formed as a pin/stud, preferably comprising a circumferential groove, for receiving a corresponding attachment element of the container, preferably formed as a hook, thereby to reversibly attach the container to the blood treatment device. The hook can be inserted into the circumferential groove to prevent slipping.

To ensure correct mounting of a container to the blood treatment device in only one possible mounting position, the blood treatment device preferably comprises two attachment elements that are formed in different sizes and/or geometrical configurations to allow attachment of a container to the blood treatment device in only one defined mounting position.

Alternatively or additionally, the blood treatment device can comprise two connection elements that are formed in different sizes and/or geometrical configurations to allow fluidic coupling of a container to the blood treatment device in only one defined mounting position.

Another aspect of the present invention refers to a system comprising at least one container according to the present invention and at least one blood treatment device according to the present invention.

Preferably, the container is reversibly attached to the blood treatment device by means of the at least one attachment element present on the container interacting with the at least one attachment element present on the blood treatment device.

Additionally or alternatively, the at least one connection element of the blood treatment device is fluidically coupled to the at least one connection element of the container.

According to a preferred embodiment of the invention, the blood treatment device is configured for opening a container, e.g. by removing a lid covering the connection elements of the container, prior to fluidically coupling the container to the blood treatment device.

For this purpose, the blood treatment device preferably comprises a lid removal element that advantageously is arranged on the attachment assembly and/or on a projection portion of the blood treatment device. Preferably, the lid removal element is a stud, hook or pin configured to be inserted into a corresponding opening/hole of an attachment portion of the lid and capture the lid.

A further aspect of the present invention refers to a method for connecting a container for concentrate, preferably a container according to the present invention, to a blood treatment device, preferably a blood treatment device according to the present invention, comprising the steps:

-   -   reversibly attaching the container to the blood treatment device         by means of the at least one attachment element present on the         container and the at least one attachment element present on the         blood treatment device;     -   moving the container in a horizontal direction/direction         projecting essentially at right angles to a side surface of the         main body of the blood treatment device towards the main body of         the blood treatment device;     -   moving the container and/or the at least one connection element         of the blood treatment device in a vertical direction/direction         projecting essentially in parallel to a side surface of the main         body of the blood treatment, thereby inserting the at least one         connection element of the blood treatment device into the at         least one connection element of the container to fluidically         couple the container to the blood treatment device.

To prevent uncontrolled dripping of liquid from the at least one connection element of the blood treatment device that can cause contaminations and/or crystallization forming on parts of the blood treatment device, the method may comprise an additional step in that the container is used to capture any liquid drops or spills originating from the at least one connection element of the blood treatment device.

Such additional steps can be, for example:

-   -   moving the container and/or the at least one connection element         of the blood treatment device in a vertical direction/direction         projecting essentially in parallel to a side surface of the main         body of the blood treatment, thereby removing the at least one         connection element of the blood treatment device inserted into         the at least one connection element of the container from the at         least one connection element of the container and thereby to         fluidically decouple the container from the blood treatment         device; and     -   pausing the movement of the container in a position in that the         at least one connection element of the container and the at         least one connection element of the blood treatment device are         at least partially aligned in a vertical direction/direction         projecting essentially in parallel to the side surface of the         main body of the blood treatment, so that any liquid dripping         from the at least one connection element of the blood treatment         device is received by the at least one connection element of the         container.

In other words, after disconnecting the container from the blood treatment device, the container is not immediately removed but remains for a while vertically below the connection element of the blood treatment device, e.g. a spout, to capture any drops dripping downwards from the connection element.

Furthermore, the method can comprise a rinsing step in that the blood treatment device is rinsed prior to connecting a container to the blood treatment device or after disconnecting the container from the blood treatment device.

In this embodiment, the blood treatment device preferably comprises a movable and/or motorized guiding element comprising the at least one attachment element of the blood treatment device and further comprising a cavity configured to receive the at least one connection element of the blood treatment device. The method further comprises the step:

-   -   moving the guiding element into a rinsing position in that the         at least one connection element of the blood treatment device is         received in the cavity, thereby to fluidically seal the blood         treatment device from the outside and allow rinsing of the blood         treatment device.

In other words, instead of inserting the connection element of the blood treatment device into the connection element of the container to, for example, dispense water into the container to dissolve concentrate powder to form a liquid concentrate, in the rinsing position, the connection element of the blood treatment device is inserted into the cavity of the guiding element.

Thus, the internal fluidic circuit of the blood treatment device is closed and rinsing fluid can be circulated in the blood treatment device.

According to an embodiment of the invention, all method steps apart from the step of reversibly attaching the container to the blood treatment device by means of the at least one attachment element present on the container and the at least one attachment element present on the blood treatment device are automatically performed by the blood treatment device.

This has the advantage that no personnel has to be present to manually connect the container to the blood treatment device. Instead, the container can be attached to the blood treatment device at an arbitrary and convenient time (e.g. during regular working hours) and the blood treatment device automatically establishes a fluid connection between the container and the blood treatment device as needed (on demand) at a specific time point (e.g. during night time) determined for example by a treatment regime.

In other words, the invention can be described as follows:

An Aspect of the invention refers to a container for concentrate, comprising: a main body for containing concentrate, a connection portion having a flat end surface and configured to connect the container to a blood treatment device, two attachment elements arranged at two opposing sides of the connection portion and configured to reversibly attach the container to two corresponding attachment elements present on a blood treatment device, and two connection elements each comprising an opening at the flat end surface of the connection portion and configured to interact with two corresponding connection elements present on a blood treatment device to fluidically couple the container with the blood treatment device by insertion of the connection elements present on the blood treatment device into the connection elements of the container, and at least one opening element configured to interact with a blood treatment device to remove a lid from the container.

In principle, other embodiments in which the end surface of the connection portion is not flat, are possible.

According to an embodiment of the invention, the at least one opening element configured to interact with a blood treatment device to remove a lid from the container has the form of a lever preferably made of a stiff material that is arranged between the lid and the flat end surface of the connection portion and is movable relative to the flat end surface, preferably in a direction away from the flat end surface.

Preferably, the lever comprises a curved section preferably at a front edge of the lever and the curved section is preferably curved away from the flat end surface of the connection portion.

According to an embodiment of the invention, the at least one opening element configured to interact with a blood treatment device to remove a lid from the container is formed as an attachment portion that is part of the lid and is configured to attach the lid to a blood treatment device, wherein the attachment portion of the lid comprises an opening into that a lid removal element of a blood treatment device can be inserted.

Preferably, the container further comprises a hook-shaped attachment element arranged adjacent to the attachment portion of the lid.

According to an embodiment of the invention the lid is a flexible film.

Another aspect of the invention refers to a blood treatment device, e.g. a dialysis machine for renal replacement therapy, comprising a main body, at least one attachment element to that a corresponding attachment element of a container for concentrate can be attached, wherein the attachment element is movable relative to the main body in a direction projecting essentially at right angles from a side surface of the main body, at least one connection element configured to fluidically couple the blood treatment device to a container for concentrate, and a lid removal element configured to interact with at least one opening element of a container to remove a lid from the container.

According to an embodiment of the invention, the lid removal element has the form of a stud projecting outwards from a projection portion of the blood treatment device.

According to another embodiment of the invention, the at least one attachment element is mounted onto a movable and/or motorized guiding element and arranged to be aligned with the lid removal element in a direction parallel to a side surface of the blood treatment device so that the lid removal element can be inserted into an opening of an attachment portion of the lid of a container attached to the at least one attachment element.

According to yet another embodiment of the invention, the blood treatment machine further comprises guiding rails configured to support a container attached to the at least one attachment element.

Another aspect of the invention refers to a system comprising at least one container according to the present invention and at least one blood treatment device according to the present invention.

Another aspect of the invention refers to a method for removing a lid from a container for concentrate, preferably a container according to the present invention, during the process of connecting the container to a blood treatment device, preferably a blood treatment device according to the present invention, comprising the steps:

-   -   reversibly attaching the container to the blood treatment device         by means of the two attachment elements present on the container         and the at least one attachment element present on the blood         treatment device;     -   inserting the lid removal element of the blood treatment device         into the opening of the attachment portion of the lid of the         container, thereby affixing the lid to the lid removal element;     -   moving the container in a direction projecting essentially at         right angles to a side surface of the main body of the blood         treatment device towards the main body of the blood treatment         device, whereby the lid is removed from the container;     -   moving the container and/or the two connection elements of the         blood treatment device in a direction projecting essentially in         parallel to a side surface of the main body of the blood         treatment device, thereby inserting the two connection elements         of the blood treatment device into the two connection elements         of the container to fluidically couple the container to the         blood treatment device.

According to an embodiment of the invention, all method steps apart from the step of reversibly attaching the container to the blood treatment device by means of the two attachment elements present on the container and the two attachment elements present on the blood treatment device and/or the step of inserting the lid removal element of the blood treatment device into the opening of the attachment portion of the lid of the container, thereby affixing the lid to the lid removal element are performed automatically.

The movement of the components of the blood treatment device and/or the container can be effected by motorization and/or by a user operating a lever or similar structure.

Further features, advantages and technical effects of the present invention become apparent from the drawings showing preferred embodiments of the invention. The drawings merely serve purposes of illustrating the invention but do not purport to limit the invention. In the drawing, same or similar components are denoted by the same reference signs.

In the drawings:

FIG. 1 shows an embodiment of a container according to the present invention;

FIG. 2 shows another embodiment of a container according to the present invention that comprises a peelable, flexible film to seal the connection elements of the container;

FIG. 3 shows how a user can peel the flexible film from the end surface of the container;

FIG. 4 shows a state in which the user has almost completely removed the flexible film from the top end surface of the container;

FIG. 5 shows a connection portion of a concentrate container according to the prior art;

FIG. 6 shows a connection portion of a container according to an embodiment of the present invention;

FIG. 7 shows a side view of the connection portion of FIG. 5 ;

FIG. 8 shows a side view of the connection portion of FIG. 6 ;

FIG. 9 shows a sectional view of the connection portion of FIG. 7 ;

FIG. 10 shows a sectional view of the connection portion of FIG. 8 ;

FIG. 11 shows a top view of the connection portion of FIG. 5 ;

FIG. 12 shows another side view of the connection portion shown in FIG. 5 ;

FIG. 13 shows a top view of the connection portion of FIG. 6 ;

FIG. 14 shows a different side view of the connection portion of FIG. 6 ;

FIG. 15 shows a perspective top view of the connection portion of FIG. 6 ;

FIG. 16 shows a detailed view of the connection portion of FIG. 6 that is sealed by a flexible film;

FIG. 17 shows a blood treatment device according to the present invention comprising two attachment elements;

FIG. 18 shows how a container is attached to the attachment elements of the blood treatment device of FIG. 17 ;

FIG. 19 shows the blood treatment device of FIG. 17 with a container attached thereto;

FIG. 20 shows the detailed view of the blood treatment device of FIG. 17 in which the guiding element is positioned relative to the projection portion in a closed, rinsing position;

FIG. 21 shows a side view of the blood treatment machine of FIG. 17 , in which the guiding element is positioned relative to the projection portion in the closed, rinsing position;

FIG. 22 shows the blood treatment device of FIG. 21 , wherein a container is attached to the attachment elements of the blood treatment device;

FIG. 23 shows a sectional view illustrating the rinsing position of the guiding element relative to the projection portion;

FIG. 24 shows a perspective view of the container that is attached to the attachment elements of the blood treatment device in the closed rinsing position;

FIG. 25 shows the container connected to the blood treatment device in a position, in which the container is fluidically coupled to the blood treatment device;

FIG. 26 shows a sectional view of the arrangement of FIG. 25 ;

FIG. 27 shows a blood treatment device, to which a container is fluidically coupled;

FIG. 28 shows the blood treatment device of FIG. 27 in the rinsing position.

FIG. 29 shows the guiding element and the projection portion of the blood treatment device in the closed rinsing position;

FIG. 30 shows the arrangement of FIG. 29 , to which a container has been attached;

FIG. 31 shows the position, in that the container is fluidically coupled to the blood treatment device;

FIG. 32 shows how the container is attached to the attachment elements of the blood treatment device;

FIG. 33 illustrates how the guide element moves inwards toward the side surface of the main body of the blood treatment device to position the container in a position that it can be fluidically coupled with the connection elements of the blood treatment device;

FIG. 34 shows a position in that the connection elements of the blood treatment device and the connection elements of the container are aligned in a vertical direction;

FIG. 35 demonstrates how the container is moved upwards to insert the connection elements of the blood treatment device into the connection elements of the container;

FIG. 36 illustrates the position of the container fluidically connected with the blood treatment device during blood treatment;

FIG. 37 demonstrates how the container is moved downwards after the treatment has ended, to fluidically decouple the connection elements of the container from the connection elements of the blood treatment device;

FIG. 38 shows how the container is held in a position, in that the connection elements of the blood treatment device and the container are fluidically coupled but aligned in a vertical direction;

FIG. 39 illustrates how droplets dripping from the connection elements of the blood treatment device are captured by the concentrate bag;

FIG. 40 demonstrates how after completion of the treatment the container is removed from the blood treatment device by moving the container away from a side surface of the blood treatment device;

FIG. 41 how after completion of the treatment the container is detached from the blood treatment device;

FIG. 42 demonstrates how the guiding element is then moved into the rinsing position by aligning the cavity present on the guiding element in a vertical direction with the connection elements of the blood treatment device; and

FIG. 43 illustrates the guiding element in the rinsing position in that the connection elements are inserted into the rinsing cavity present in the guiding element.

FIG. 44 shows an embodiment in which the guiding element can be manually moved using a lever 21.

FIG. 45 shows an embodiment of a container that is configured to be automatically opened by a blood treatment device.

FIG. 46 shows the container of FIG. 45 in a state in that the opening elements are moved upwards to remove the lid.

FIG. 47 shows the container of FIG. 45 in a state in that the opening elements are moved upwards by a blood treatment device to remove the lid.

FIG. 48 shows a sectional view of the container of FIG. 45 .

FIG. 49 shows an alternative embodiment of a container that is configured to be automatically opened by a blood treatment device.

FIG. 50 shows the attachment assembly of a blood treatment device to be used with the container of FIG. 49 .

FIG. 51 illustrates how the container according to FIG. 49 is attached to a blood treatment device.

FIG. 52 shows a state in that the container is attached to the blood treatment device.

FIG. 53 shows a state in that the lid is removed from the container and the container is attached to the blood treatment device.

FIG. 54 shows a blood treatment device to be used with the container of FIG. 49 .

As shown in FIG. 1 , a container 1 comprises a main body 2 configured to contain a dry and/or liquid concentrate. Furthermore, the container 1 comprises two attachment elements 3 having the form of hooks that are arranged at opposite sides of an attachment portion 4 of the container 1.

Furthermore, the container 1 comprises connection elements 5 that are opened towards a top end surface 6 of the connection portion 4 of the container 1 that is opposite to/facing away from the main body 2. In this embodiment, the container also comprises a handle 22 allowing a user to grip the container 1. The top end surface 6 is sealed by a flexible film 7 that covers the connection elements 5 as well as the central opening 8 of the connection portion 4.

FIG. 2 shows another container 1 according to the present invention. In this embodiment the flexible film seals the connection element 5 but does not completely cover the central opening 8. Furthermore, in this embodiment, the attachment elements 3 take the form of hollow cylinders configured to receive corresponding studs/pins of a blood treatment device.

FIG. 3 shows a user peeling off the flexible film 7 from the top end surface 6 of the container 1. As in all drawings, components denoted by the same reference numerals are the same or similar components.

In the state shown in FIG. 4 , the user has almost completely removed the flexible film 7 from the top end surface 6 of the container 1.

FIG. 5 shows a connection portion 4 of a concentrate container known from the prior art. Such conventional connection portions of containers known from the prior art generally comprise connection elements 5 that are opened downwards so that liquid can drip from these connection portions into connection elements present on the blood treatment device that are configured to be inserted into the connection elements 5. The connection portion further comprises a handle 22 allowing a user to grip the connection portion.

FIG. 6 shows a connection portion 4 of the container according to the present invention. This connection portion comprises attachment elements 3 formed as hollow cylinders and configured to receive corresponding connection elements, especially in the form of studs, pins or cylinders, present on the blood treatment device.

The connection portion 4 further comprises connection elements 5 that are opened upwards towards a top end surface 6 of the connection portion.

According to this embodiment, the connection portion 4 furthermore comprises gripping portions 9 at opposing sides of the connection portion 4 that replace the handle 22 present in the conventional connection portion shown in FIG. 5 .

FIG. 7 shows the connection portion 4 according to the prior art in a side view, showing the connection elements 5 as well as the handle 22. In comparison to that, the connection portion 4 of the container according to the present invention shown in FIG. 8 comprises attachment elements 3 arranged at opposing sides of the connection portion 4 and formed as hollow cylinders. The openings of the connection portions cannot be seen in this view.

FIG. 9 shows a sectional view of the connection portion 4 of FIG. 7 in that the handle 22 is clearly visible. In the sectional view of the connection portion 4 according to the present invention in FIG. 10 , the gripping portions 9 are clearly visible as well as the attachment elements 3 and the connection elements 5 that are opened towards a top end surface 6 of the connection portion 4.

As can be seen from FIG. 11 , the connection elements 5 of the connection portion 4 according to the prior art also function as attachment elements, because the connection elements 5 in the form of hollow cylinders are arranged over corresponding spouts of the blood treatment device.

This is further illustrated in the view of FIG. 12 , from that it can be seen that attachment elements of the blood treatment device, i.e. connection elements of a blood treatment device according to the prior art are inserted into the connection elements 5 of the connection portion 4 in an essentially vertical position/direction in FIG. 12 , thereby allowing liquid from the connection elements 5 to drip out of the connection elements 5 of the connection portion 4 of a container 1.

As shown in FIG. 13 , according to the present invention, the attachment elements 3 and the connection elements 5 are separate from each other. From FIG. 13 it can also be easily seen, that the attachment elements 3 and the connection elements 5 are arranged relative to each other in that they project along directions that are essentially arranged at right angles to each other, preferably horizontally and vertically respectively.

In the example of FIG. 13 , the attachment elements project in a direction from the top of FIG. 13 to the bottom of FIG. 13 whereas the connection elements 5 are openings projecting or extending in the direction into and out of the paper plane.

FIG. 14 provides another clear view of the gripping portion 9, that can substitute the handle 22 present in connection portions 4 known from the prior art.

FIG. 15 further illustrates how the direction of extension of the attachment elements 3 is arranged essentially at right angles to the direction of extension of the connection elements/openings 5.

As can be seen in FIG. 16 , the connection elements 5 are preferentially sealed off by the flexible strip 7 that is preferentially welded to the top end surface 6 of the connection portion 4 to close the connection elements 5.

Preferentially, the flexible film 7 comprises a gripping section 10 that allows the user to grip the flexible film 7 to remove the flexible film 7 from the top end surface 6 of the connection portion 4 of container 1.

As can be seen in FIG. 17 , a blood treatment device 11 according to the present invention includes a main body 12 that has a bottom surface 13 and a attachment assembly 14 configured for attaching to and connecting to the container 1.

The attachment assembly 14 comprises a guiding element 15 to which two attachment elements 16 are mounted that in this embodiment have the form of protruding cylinders/studs/pins each having a circumferential groove into which the hooks or hook-shaped attachment elements 3 of a container 1 can be inserted.

The attachment assembly 14 furthermore comprises a projection portion 17. In the configuration shown in FIG. 17 , a front surface 18 of the projection portion 17 and front surface 19 of the guiding element 15 are aligned with each other to form a continuous front surface of the attachment assembly 14. This corresponds to the rinsing position.

As can be seen in FIG. 18 , a bag 1 can be attached by means of hook shaped attachment elements 3 onto the stud-shaped attachment elements 16 mounted onto the guiding element 15.

FIG. 19 shows the blood treatment device 11 with a container 1 attached to the attachment elements 16 of the guiding element 15. The container 1 is in a position in which it is fluidically coupled to the blood treatment device.

FIG. 20 shows the attachment assembly 14 of a blood treatment device 11 in that the guiding element 15 is arranged relative to the projection portion 17 in a closed position used for rinsing the blood treatment device.

In this position, a front surface 18 of the projection portion 17 and a front surface 19 of the guiding element 15 form a continuous front surface. The rinsing position of the guiding element 15 relative to the projection portion 17 is further illustrated in a side view of the blood treatment device 11 shown in FIG. 21 . From this figure it becomes especially clear, that in the closed position/rinsing position of the guiding element relative to the projection portion 17, the front end surface 18 of the projection portion 17 and the front end surface 19 of the guiding element 19 form a continuous front end surface.

FIG. 22 shows the blood treatment device of FIG. 21 , with a container 1 being attached via its attachment elements 3 to the attachment elements 16 of the blood treatment device. This position is adopted when the blood treatment device is rinsed/disinfected by internal circulation but already prepared for the next blood treatment by the provision of the container 1. Prior to commencing the next blood treatment, the container 1 will be fluidically connected to the blood treatment device 11.

FIG. 23 illustrates in more detail the structural configuration of the attachment assembly 14 of the blood treatment device by providing a sectional view of the attachment assembly 14 in the closed/rinsing position illustrated in FIGS. 21 and 22 . As can be seen in FIG. 23 , the front end surfaces 18 and 19 of the projection portion 17 and the guiding element 15 provide a continuous front surface.

In this relative positioning, the connection element 20 of the blood treatment device that in the embodiment of FIG. 23 has the form of a spout used for dispensing water into the container 1 is inserted in a cavity 18 present in the guiding element 15. Thus, the internal fluidic system of the blood treatment device is closed off from the outside and rinsing fluid can be circulated within the blood treatment device without fluid leaking from the spout 17 to the outside of the blood treatment device 11.

FIG. 24 shows a close-up view of the connection assembly 14 of the blood treatment device 11 to that a container 1 has been attached via the attachment elements 3 and 16. The connection assembly 14 is in the closed position/rinsing position.

In order to fluidically couple the container 1 to the connection assembly 14 and thus to the blood treatment device 11, the guiding element 15 is subsequently moved inwards towards the side surface of the blood treatment device 11, as shown in FIG. 25 . The container 1 attached to the attachment element 16 of the blood treatment device 11 is thus moved towards the side surface of the blood treatment device 11 until it is arranged under the projection portion 17 and the connection elements 5 of the bag 1 are horizontally aligned with the connection elements 20 of the blood treatment device.

As illustrated in FIG. 26 , the guiding element 15 and thus the container 1 attached to the attachment elements 16 mounted onto the guiding element 15 are moved upwards to connect the connection elements 5 of the container 1 with the connection element 20 of the blood treatment device. Alternatively the container 1 can be held stationary by the guiding element 15 and the connection elements 20 of the blood treatment device are moved downwards to be inserted into the connection elements 5 of the container 1 to thereby fluidically couple the container 1 to the blood treatment device 11.

FIG. 27 shows a side view of the blood treatment device with a container 1 fluidically coupled to the blood treatment device 11 in that position/relative positioning shown in FIG. 26 .

FIG. 28 shows a side view of the blood treatment device 11 with the attachment assembly 24 being in the position shown in FIG. 24 .

FIG. 29 shows another view of the connection assembly 14 of the blood treatment device in the closed rinsing position.

FIG. 30 shows the attachment assembly 14 of FIG. 29 , wherein a container 1 has been attached via its attachment elements 3 (hook-shaped) and the attachment elements 16 (stud-shaped) of the blood treatment device. In this depiction, the attachment assembly 14 is still in the closed rinsing position.

FIG. 31 shows the attachment assembly 14, wherein the container 1 has been moved inwards under the projection portion 17 and has been fluidically coupled to the blood treatment machine by inserting the connection elements of the blood treatment device into the connection elements of the container 1, by either moving the container 1 upwards towards the projection portion 17 or by moving the connection elements 20 of the blood treatment device downwards into the connection elements 5 of the container 1.

Next, a method of connecting a container for concentrate to a blood treatment device according to the present invention will be described.

As shown in FIG. 32 , the attachment elements 16 of the blood treatment device are inserted into the attachment elements 3 of the container 1. As can be seen in FIG. 32 , the attachment elements 16 of the blood treatment device and the attachment element 3 of the container are configured asymmetrically to allow mounting of the container to the blood treatment device only in one correct mounting position.

FIG. 33 shows the container 1 connected to the attachment elements 16 of the blood treatment device via the attachment elements 3 of the container. The guiding element 15 then moves inwards in a horizontal direction toward a side surface of the blood treatment device 11 to draw the container 1 under the projection portion 17, as illustrated in FIG. 34 .

Also from FIG. 34 it can be seen that the connection elements 20 of the blood treatment device and the connection elements 5 are in this position aligned in a vertical direction so that the connection elements 20 can be inserted into the connection elements 5 of the container 1 by movement along the vertical axis.

As shown in FIG. 35 , the connection elements 20 of the blood treatment device can be/are inserted into the connection elements 5 of the container 1 by moving the guiding element 15 and thus the container 1 upwards towards the projection portion 17. Alternatively, the connection elements 20 of the blood treatment device can be moved downwards to be inserted into the connection elements 5 of the container 1.

When the container 1 is fluidically coupled to the blood treatment device via the connection elements 20 and the connection elements 5 as shown in FIG. 36 , treatment can be carried out by the blood treatment machine that generates the liquid concentrate from the powder concentrate contained within the main body 2 of the container

After treatment has finished, the guiding element 15 and thus the container 1 attached thereto is moved downwards, as illustrated in FIG. 37 . The downward movement of the container 1 is continued until the connection elements 20 of the blood treatment device are removed from the connection elements 5 of the container 1, as illustrated in FIG. 38 .

The guiding element 15 and thus the container 1 attached thereto is then subsequently moved outwards in a horizontal direction similar to a drawer from the side surface of the blood treatment device 11.

As illustrated in FIG. 39 , the movement of the container 1 can be paused in a position in which the container 1 is vertically aligned with the connection elements 20 of the blood treatment device, so that any droplets dripping from the connection elements 20 of the blood treatment device are caught by the container 1, preferably the connection elements 5 of the container 1.

As shown in FIG. 40 , the container 1 is then moved by means of moving the guiding element 15 relative to the projection portion 17 until the container 1 is positioned further out/away from the side surface of the blood treatment device 11 than the front edge of the projection portion 17. This allows a user to easily grab the container

As shown in FIG. 41 , the container 1 can easily be disconnected from the attachment elements 16 of the blood treatment device by pulling the container 1 away from the blood treatment device 11.

After the container 1 has been removed, the blood treatment machine can then move the guiding element 15 upwards and/or inwards towards the side surface of the blood treatment device 11 until the connection elements 20 of the blood treatment device are aligned in a vertical direction with the cavity 18 of the guiding element 15, as shown in FIG. 42 .

In this position, the blood treatment device can enter the closed/rinsing position. As shown in FIG. 43 , the guiding element 15 is moved further upwards or the connection elements 20 of the blood treatment device 11 are further moved downwards, to insert the connection elements 20 into the cavity 18 of the guiding element 15 to enter the closed rinsing position.

The blood treatment machine can now be rinsed and a new concentrate bag can be attached during rinsing to the guiding element 15 by use of attachment elements 16 to commence a new treatment.

All movements of the guiding element 15 relative to the projection portion 17 can also be performed manually. For this purpose an attachment assembly 14 of a blood treatment device can comprise a lever 21 as shown in FIG. 44 or a similar structure allowing a user to manually move the guiding element relative to the projection portion 17.

As shown in FIG. 45 , a container 1 according to the present invention may comprise a number of opening elements 23 that in this embodiment have the form of levers. The number of opening elements is arbitrary.

The levers 23 each comprise a curved section 24 that is curved away from an end surface 6 of the connection portion 4 of the container 1.

The levers 23 can be moved upwards/away from the end surface 6 of the connection portion as shown in FIG. 46 to remove the lid 7 from the connection portion 4 to thereby open the connection elements 5 allowing these to be fluidically coupled to connection elements 20 of the blood treatment device.

If the container of FIG. 45 is attached to the attachment assembly 14 of a blood treatment device 11 by means of the attachment elements 3 and 16, the opening elements/levers 23 are moved upwards by a blood treatment device to remove the lid 7 when the guiding element 15 and thus the container 1 attached thereto is moved towards a side surface of the blood treatment device. In other words, if the guiding element 15 is moved relative to the projection portion 17 of the blood treatment device 11 towards the side surface of the blood treatment device, the levers 23 run up against the projection portion 17 and are deflected upwards due to the curvature of the curved portions 24 and the lid 7 is peeled off the connection portion 4.

As can be seen in the sectional view of the container in FIG. 48 , the opening elements/levers 23 do not necessarily be linked to the connection portion 4 via hinges by can loosely lie on the connection portion and be held in place by the lid 7/flexible film to that the levers 23 each are attached.

FIG. 49 shows an alternative embodiment of a container that is configured to be automatically opened by a blood treatment device. In this embodiment, the lid 7 comprises an attachment portion 25 having an opening/hole 26 into that a lid removal element of a blood treatment device can be inserted.

In this embodiment, the container comprises three attachment elements 3. One attachment element 3 is arranged directly adjacent to the attachment portion 25 and is formed as a hook designed to be inserted into an attachment element present on a guiding element 15 of a blood treatment device so that the container can be pulled by the guiding element under the projection portion 17 of the blood treatment device 11.

FIG. 50 shows the attachment assembly 14 of a blood treatment device 11 to be used with the container of FIG. 49 . The projection portion 17 comprises a lid removal element 28 that in this embodiment has the form of pin/stud projection outward from the projection element 17 and that is configured to be inserted into the opening 26 of the attachment portion 25 of the lid 7 of a container 1.

The guiding element 15 comprises an attachment element 27 to that the attachment element 3 of the container 1 can be attached/hooked. The attachment assembly 14 further comprises two support elements/guiding rails 29 that arranged stationary relative to the blood treatment device and provide support for the container 1 that is attached to the guiding element 15 and drawn by the guiding element 15 under the projection portion 17.

FIG. 51 illustrates how the container is attached to a blood treatment device. The attachment element 3 adjacent to the attachment portion 25 is hooked over the attachment element 27 of the guiding element 25. The lid removal element 28 is inserted into the opening 26 of the lid 7.

FIG. 52 shows a state in that the container is attached to the blood treatment device. The lid removal element 28 is inserted into the opening 26 of the lid 7. The other attachment elements 3 are arranged above the guiding rails 29 so that the attachment elements 3 slide on the guiding rails 29 as the container is drawn under the projection portion 17 by the guiding element 15.

FIG. 53 shows a state in that the lid is removed from the container and the container is attached to the blood treatment device. This depiction shows how the attachment elements 3 of the container are slidably arranged on the guiding rails 29 so that the guiding rails 29 support the container 1 during the relative movement of the container 1 to the blood treatment device 11. 

The invention claimed is:
 1. Container for concentrate, comprising: a main body for containing concentrate, a connection portion having a flat end surface and configured to connect the container to a blood treatment device, two attachment elements arranged at two opposing sides of the connection portion and configured to reversibly attach the container to two corresponding attachment elements present on a blood treatment device, and two connection elements each comprising an opening at the fiat end surface of the connection portion and configured to interact with two corresponding connection elements present on a blood treatment device to fluidically couple the container with the blood treatment device by insertion of the connection elements present on the blood treatment device into the connection elements of the container, and at least one opening element configured to interact with a blood treatment device to remove a lid from the container.
 2. Container according to claim I, wherein the at least one opening element configured to interact with a blood treatment device to remove a lid from the container has the form of a lever made of a stiff material that is arranged between the lid and the flat end surface of the connection portion and is movable relative to the flat end surface, in a direction away from the flat end surface.
 3. Container according to claim 2, wherein the lever comprises a curved section at a front edge of the lever and the curved section is curved away from the flat end surface of the connection portion.
 4. Container according to claim 1, wherein the at least one opening element configured to interact with a blood treatment device to remove a lid from the container is formed as an attachment portion that is part of the lid and is configured to attach the lid to a blood treatment device, wherein the attachment portion of the lid comprises an opening into that a lid removal element of a blood treatment device can be inserted.
 5. Container according to claim 4, wherein the container further comprises a hook-shaped attachment element arranged adjacent to the attachment portion of the lid.
 6. Container according claim 1, wherein the lid is a flexible film.
 7. Blood treatment device, comprising a main body, at least one attachment element to that a corresponding attachment element of a container for concentrate can be attached, wherein the attachment element is movable relative to the main body in a direction projecting essentially at right angles from a side surface of the main body, at least one connection element configured to fluidically couple the blood treatment device to the container for concentrate, and a lid removal element configured to interact with at least one opening element of the container to remove a lid from the container.
 8. Blood treatment device according to claim 7, wherein the lid removal element has the form of a stud projecting outwards from a projection portion of the blood treatment device.
 9. Blood treatment device according to claim 7, wherein the at least one attachment element is mounted onto a movable and/or motorized guiding element and arranged to be aligned with the lid removal element in a direction parallel to a side surface of the blood treatment device so that the lid removal element can be inserted into an opening of an attachment portion of the lid of the container attached to the at least one attachment element.
 10. Blood treatment device according to claim 7, further comprising guiding rails configured to support the container attached to the at least one attachment element.
 11. System comprising at least one container for concentrate according to claim 1 and at least one blood treatment device having a main body, at least one attachment element to that a corresponding attachment element of the container for concentrate can be attached, wherein the attachment element is movable relative to the main body in a direction projecting essentially at right angles from a side surface of the main body, at least one connection element configured to fluidically couple the blood treatment device to the container for concentrate, and a lid removal element configured to interact with at least one opening element of the container to remove a lid from the container.
 12. Method for removing a lid from the container for concentrate according to claim 1, during the process of connecting the container to a blood treatment device having a main body, at least one attachment element to that a corresponding attachment element of the container for concentrate can be attached, wherein the attachment element is movable relative to the main body in a direction projecting essentially at right angles from a side surface of the main body, at least one connection element configured to fluidically couple the blood treatment device to the container for concentrate, and a lid removal element configured to interact with at least one opening element of the container to remove a lid from the container, said method, comprising the steps: reversibly attaching the container to the blood treatment device by means of the two attachment elements present on the container and the at least one attachment element present on the blood treatment device; inserting the lid removal element of the blood treatment device into the opening of the attachment portion of the lid of the container, thereby affixing the lid to the lid removal element; moving the container in a direction projecting essentially at right angles to a side surface of the main body of the blood treatment device towards the main body of the blood treatment device, whereby the lid is removed from the container; moving the container and/or the two connection elements of the blood treatment device in a direction projecting essentially in parallel to a side surface of the main body of the blood treatment device, thereby inserting the two connection elements of the blood treatment device into the two connection elements of the container to fluidically couple the container to the blood treatment device.
 13. Method according to claim 12, wherein all method steps apart from the step of reversibly attaching the container to the blood treatment device by means of the two attachment elements present on the container and the two attachment elements present on the blood treatment device and/or the step of inserting the lid removal element of the blood treatment device into the opening of the attachment portion of the lid of the container, thereby affixing the lid to the lid removal element are performed automatically. 